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Multi-point chlorination process for drinking water

A drinking water, multi-point technology, applied in water/sewage multi-stage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of algae cell rupture and release

Inactive Publication Date: 2020-10-23
SHANGHAI MUNICIPAL WATER RESOURCES DEV & UTILIZATION NAT ENG CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Halogenated disinfection by-products have potential health risks and are the focus of drinking water quality monitoring, and high concentrations of pre-chlorination will cause algal cell rupture and release a large amount of organic matter, causing the organic matter to react with chlorine, resulting in more disinfection by-products
However, low concentrations of chlorine cannot play a good role in the oxidative degradation of organic matter

Method used

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  • Multi-point chlorination process for drinking water
  • Multi-point chlorination process for drinking water
  • Multi-point chlorination process for drinking water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this example, the effects of chlorination in water sources are as follows: figure 2 shown. The algae in the raw water has reached tens of millions, and the amount of chlorine added by the pump station at the water source (calculated as chlorine) is 1.0 mg / L, which promotes and improves the effect of algae removal. After the chlorination treatment of the raw water system, not only the algae in the raw water of each water plant has been significantly reduced, but also the subsequent coagulation and other processes of the water plant are also more beneficial. From the perspective of algae removal effect, after chlorination, the algae cell density of the raw water reaching the head of the water plant can be reduced by about 80% on average, and the overall algae cell density can be reduced by an order of magnitude, and it can be controlled at about one million / L.

Embodiment 2

[0044] In this example, the treatment process of a certain water plant is a conventional process (ie coagulation, sedimentation, filtration, disinfection). The raw water is sent to the water plant after being chlorinated by the pump station at the water source. The residual chlorine in the raw water entering the plant is 0.15-0.30mg / L, and it is slightly higher in early April and mid-May, close to 0.3mg / L. The amount of pre-chlorination and post-chlorination in this water plant is 0.4-3.0mg / L and 0.9-1.2mg / L. During this period, the free chlorine in the sinking water is controlled at 0.1-0.4mg / L, and the removal effect on algae is as follows: image 3 shown. From April to May in the spring of 2016, the density of raw water algae entering the factory is 8.5 to 36.1×10 6 per L, the free chlorine in the sinking water is controlled at about 0.2~0.4mg / L, and the density of algae is lower than 1.1×10 6 / L, sand filter water was not detected. In autumn (August-September), the dens...

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Abstract

The invention discloses a multi-point chlorination process for drinking water. The multi-point chlorination process comprises the steps: step S1, determining the pre-pumping chlorination amount according to the algae density in water in a water delivery pump station of a water source area, and chlorinating raw water; step S2, enabling the raw water after chlorination in the step S1 to enter a water plant for pretreatment, pre-chlorinating with a sedimentation tank as a control point, and obtaining sedimented water after pre-chlorination, coagulation and sedimentation; step S3, filtering the sedimented water obtained in the step S2 to obtain filtered water; and step S4, sterilizing the filtered water obtained in the step S3 to obtain drinking water reaching the standard. According to the invention, by optimizing the chlorine addition amount of the pump station in the water source area and the pre-chlorination amount of the water plant, fine management of algae control and chlorine addition can be realized.

Description

technical field [0001] The invention relates to the technical field of drinking water treatment, in particular to a multi-point chlorination process for drinking water. Background technique [0002] In the process of water treatment, disinfection is a guarantee step for the biological safety of drinking water. At present, most domestic drinking water disinfection processes are chlorine disinfection processes. With the increasingly serious pollution of water sources and the increasing types of pollutants, new requirements have been put forward on how to determine the dosage of chlorine and the filling point of chlorine disinfection. Too little chlorine will not be able to achieve the disinfection effect, and excessive chlorine will not only cause waste, produce odor, but also easily produce disinfection by-products such as trihalomethanes. Therefore, reasonable control of chlorine addition amount and setting of chlorine addition point are key issues in water treatment. [...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/76C02F1/52C02F1/001C02F2303/04
Inventor 王铮赵平伟朱斌钱灏张东沈元静夏萍朱文滨
Owner SHANGHAI MUNICIPAL WATER RESOURCES DEV & UTILIZATION NAT ENG CENT